Sheet-glass apparatus



May 2 0, 1930.

L. MAMBOURG SHEET GLASS APPARATUS Filed Sept. 20, 1926 alike am:

Leopold Ndmbourg.

Patented May 20, 1930 1,759,235

UNITED STATES PATENT OFFICE LEOPOLD MAMBOURG OF LANCASTER, OHIO,ASSIGNOR TO LIBBEY-OWENS GLASS COMPANY, OF TOLEDO, OHIO, A CORPORATIONOF OHIO SHEET-GLASS APPARATUS Application filed September 20, 1926.Serial No. 136,459.

The present invention relates to sheet glass through a portion of asheet glass apparatus apparatus, and has particular reference to theillustrating my invention in use, and continuous production of sheetglass. Fig. 2 is a transverse section through a An important object ofthe invention is to draw pot showing the invention in use. 5 provide insheet glass apparatus a draw pot The present invention relates more par-55 containing a mass of molten glass from which ticularly to acontinuous system wherein a a sheet can be continuously produced, andsheet may be continuously drawn from amass means arranged above themolten glass, in of molten glass contained in a suitable draw said pot,for protecting the same from the pot. Heretofore, in this type ofapparatus it t h has been customary to expose a considerable A furtherobject of th invention i to portion of the surface of the molten glassVide in sheet glass apparatus a draw pot from which the sheet is drawnto the atmoswhich may be continuou l l i h d ith phere. I have found inactual practice that molten glass from a tank furnace, and inconditionscan be disturbed, and difficulty eluding means for separating the gasesabove had W th he production of a high quality of the glass in thedrawpot from the gases above hee by the mere opening or closing of a doorthe glass in said tank fu n c or window in the building in which the ma-A further obj t of th inv ntio i to r chine is located. It is an aim,therefore, in vide in an apparatus of thi natur a d aw pot the presentinvention to provide an apparatus 0 containingamass of molten glass fromwhich wherein desirable conditions may be set up a sheet may b drawn,and in ludin hood and maintained in a manner that the molten meansarranged abov th draw t f glass and sheet are practically free fromtecting the surface of the molten glass, from hanges due to atmosphericchanges. which the sheet is drawn, from the atmos- In he drawings, thenumeral 5 designates phere. a tank furnace having associated therewith aA still further object of the invention is to draw pot arranged in opencommunication provide in heet gla s apparatu in luding a wlth thefurnace, the pot being supplied with draw pot containing a mass ofmolten glass, molten glass 7. A sheet 8 may be continfrom which asheetmay be drawn,hood means usly drawn from the molten mass 7, pref- 0arranged above the surface of said glass erably in a vertical planeinitially, and then adapted to protect the same from the atmosdeflectedover a suitable member 9 so that it phere, and including adjustablemeans formay be passed in a horizontal plane over a protecting the sheetfrom the atmosphere dursuitable drawingand flattening table 10 and r ingits formative period. on through an annealing leer, not shown. The Stillanother and important object is to roll 9 is interposed between theroll9and the provide a draw pot for use in sheet glass apdrawing means10. The roll 9' is positively paratus, the inner surface of the bottomof iven nd assists in drawing the sheet 8 which being curved at itsclosed end to prefrom the mass of molten glass 7. Suitable vent theaccumulation of stagnant glass, the width maintaining devices 11 may beused sheet of glass being produced from the molten o prevent narrowing othe sheet- The means mass in said pot being so drawn that the base 11are preferably arranged near the base 12 thereof is arranged relativelyclose to the of the sheet. 7 l d d f id ot, In carrying out myinvention, the bottom Other objects and advantages of the invenof thepot 6 is provided with the curved surtion will become more apparentduring the face 13 so that there will be no tendency for course of thefollowing description. an accumulation of glass at this end of the Inthe drawings wherein like numerals are pot. The base 12 of the sheet ispreferably employed to designate like parts throughout arrangedrelativel close to the end wall'l t the same, of the pot. The si e ofthe sheet adJacent the Fig. 1 is a vertical longitudinal section closedend 14 of the pot will be supplied from T glass passing under the sheet.As the base is arranged close to the wall 14, there will be a continuousmovement of glass preventing an accumulation of stagnant glass. Stagnantglass becomes devitrified, in time forming what is known in the art asdog metal. At frequent intervals when this dog metal forms, it isnecessary to stop forming a sheet and boil out this devitrified glass,causing a loss of time and production. By forming the curved surface 13and shortening the pot, the tendency toward the formation of dog metalis reduced to a minimum.

The numeral 15 designates a jack arch arranged substantially at thejuncture of the furnace 5 and pot 6. The jack arch 15 is provided with arecess 16 extending transversely of the pot to form a shoulder 17 uponwhich may be supported one end of a cover tile or hood 18. The hood 18,as shown in Fig. 2-, is provided with the side walls 19 and extensions20 supported upon the slabs 21. Suitable openings are provided in thewalls 19 to permit operation of the edge engaging means 11.

On the opposite side of the sheet 8 is a second hood 22 provided withthe extensions 23 so that the hood may be supported upon the end of thepot. Adjustably associated with the hoods 18 and 22 are preferablymetallic plates 24 which may be shaped as illustrated, adjustment beinghad by means of the bolts 25 operating through the slots 26.

Depending from the hood 18 is a baffle wall 27 which maybe dipped. intothe glass as inclicated by the dotted lines 28, or short enough to justclear the surface of the molten glass as illustrated in heavy lines.

It has been common practice heretofore to permit the gases above theglass in the draw pot to mingle with or be a part of the gases above theglass in the tank furnace. Difficulty has been experienced with thisarrangement because it is practically impossible to set up one conditionin the melting end without disturbing the condition desired in the drawpot, or vice-versa.

By placing the baille wall 27 substantially as illustrated, it ispossible to set up any desired condition on either side of the wallwithout one-condition interfering with the other. Suitable burners orthe like 29 may be employed under the hood 18 as illustrated.

The hoods are provided to protect the surface of the molten glass 7 fromthe atmosphere, while the adjustable plates 24 protect the base of thesheet and the sheet proper from the atmosphere during its formativeperiod. Of course, the plates 24 can be adjusted totake care of thethickness of the sheet being produced. In some instances, it may bedesirable to position heat absorbing members 30 which comprisesubstantially rectangular bodies through which a suitable fluid may becirculated.

To enable the operator to inspect the sheet being produced, windows 31may be arranged at the ends of the hoods and prefcrably in alignmentwith the sheet, the windows being movable in the slots 32.

lVith the construction hereinabove described, a sheet of glass may becontinuously drawn from the surface of a mass of molten glass. sheet isdrawn is preferably contained in a draw pot arranged in opencommunication with a tank furnace. To separate the gases above themolten glass in the draw pot from the gases in the tank furnace, abaffle plate is provided. As has been stated, the temperatures in thefurnace and draw pot can be independently controlled, thus enabling thesheet operator to maintain any desired temperature at his end, while themelting end can be controlled Without thought of the sheet end. Thisadvantage will be readily apparent to those versed in the art..

In addition to separating these two portions of the furnace, the surfaceof the glass in the draw pot and the base of thesheet are protected fromthe atmosphere which also elps the operator to maintain a desirableworking condition.

The adjustable plates are preferably positioned in a manner that thesheet is free from contact with the atmosphere until said sheet hasbecome practically set. After the sheet has become substantially set itis less subject to the influence of the atmosphere than during itsformative period.

It is to be understood that the form of the invention herewith shown anddescribed is to be taken as the preferred embodiment of the same, andthat various changes in the shape, size and arrangement of parts may beresorted to without departing from the spirit of the invention or thescope of the subjoined claims.

Claims:

1. In sheet glass apparatus, a receptacle containing a mass of moltenglass, means for drawing a sheet therefrom, a roll over which the sheetis deflected into a horizontal plane, a hood arranged over thereceptacle and adapted to protect the sheet from the atmosphere duringits formative period, and heat absorbing means arranged between the hoodand said roll.

2. In sheet glass apparatus, a receptacle containing a mass of moltenglass, means for drawing a sheet therefrom, a roll over which the sheetis deflected into a horizontal plane, a hood arranged over thereceptacle and adapted to protect the sheet from the atmosphere duringits formativeperiod, and heat absorbing means arranged on both sides ofthe sheet and mounted between the hood and said roll.

3. In sheet glass apparatus, a receptacle containing a mass of moltenglass, means for drawing a sheet therefrom, a roll over which The moltenglass from which the the sheet is deflected into a horizontal plane, ahood arranged over the receptacle and adapted to protect the sheet fromthe atmosphere during its formative period, heat absorbing meansarranged between the hood and said roll, and a depending baflle wallcarried by one end of the said hood.

4. In sheet glass apparatus, a receptacle containing a mass of moltenglass, means for drawing a sheet therefrom, a roll over which the sheetis deflected into a horizontal plane, a hood arranged over thereceptacle and adapted to protect the sheet from the atmosphere duringits formative period, heatabsorbing means arranged on both sides of thesheet and mounted between the hood and said roll, and a depending bafflewall carried by one end of said hood.

5. In sheet glass apparatus, a receptacle containing a mass of moltenglass, means for drawing a sheet therefrom, a roll over which the sheetis deflected into a horizontal plane, a hood arranged over thereceptacle and adapted to protect the sheet from the atmosphere duringits formative period, and heat absorbing means arranged between the hoodand said roll, said hood having portions resting on the receptacle.

6. In sheet glass apparatus, a receptacle containing a mass of moltenglass, means for drawing a sheet therefrom including a roll over whichthe sheet is drawn and deflected into a horizontal plane, a hood havingadjustable portions arranged over the mass of molten glass and adaptedto protect the sheet from the atmosphere during its formative period,said adjustable portions controlling the exposure of the sheet duringits formative period to the atmosphere, and heat absorbing meansarranged on both sides of the sheet and mounted between the adjustableportions of said hood and the roll over which the sheet is deflected.

7. In sheet glass apparatus,a receptacle containing a mass of moltenglass, means for drawing a sheet therefrom including a roll over whichthe sheet is drawn and deflected into a horizontal plane, a hood havingadjustable ortions arranged over the mass of molten g ass and adapted toprotect the sheet from the atmosphere during its formative period, saidadjustable portions controlling the exposure of the sheet during itsformative period to the atmosphere, heat absorbing means arranged onboth sides of the sheet and mounted between the adjustable portions ofsaid hood and the roll over which the sheet 60' into a horizontal plane,a hood having adjustable portions arranged over the mass of molten glassand adapted to protect the sheet from the atmosphere during itsformative period, said adjustable portions controlling the exposure ofthe sheet during its formative period to the atmosphere, heat absorbingmeans arranged on both sides of the sheet and mounted between theadjustable portions of said hood and the roll over which the sheet isdeflected, and transparent means arranged in said hood to permitinspection of the sheet durinlg its formative period.

9. n sheet glass apparatus, a furnace containing a mass of molten glass,a draw-pot in open communication therewith and adapted to receive moltenglass therefrom, a cross member arranged transversely of the flow ofglass and mounted substantially at the juncture of the furnace with thedraw pot, a hood arranged over the glass in the draw-pot and having aportion engageable with said cross member whereby to assist insupporting the hood, and a baflle wall depending from said hood andarranged in close proximity to the cross member.

10. In sheet glass apparatus, a furnace containing a mass of moltenglass, a draw-pot in.

open communication therewith and adapted to receive molten glasstherefrom, a cross member arranged transversely of the flow of glass andmounted substantially at the juncture of the furnace with the draw-pot,a hood arranged over the glass in the draw-pot and having a portionengageable with said cross member whereby to assist in supporting thehood, a baffle wall depending from said hood and arranged in closeproximity to the cross member, means for drawing a sheet from the massof molten glass, and heat absorbing means arranged directly above theshield and in proximity to the sheet being drawn.

11. The method of forming sheet glass which comprises drawing a sheet uwardly by a surface moving in contact with t e sheet perature of thesheet of glass at a point above said pool, and cooling the surface ofthe glass at a point between said moving surface and the first-namedpoint. i

12. The method of forming sheet glass which comprises drawing a sheet incontact with a rotating surface disposed above the level of a pool ofglass, maintaining the sur-' face temperature of the sheet of glass at apoint above said pool, and cooling the surface of the glass at a pointbetween said rotating surface and the first-named point.

Signed at Lancaster, in the county of Fairfield and State of Ohio, this11th day of September, 1926.

LEOPOLD MAMBOURG.

